864185197 has 2 divisors, whose sum is σ = 864185198. Its totient is φ = 864185196.

The previous prime is 864185183. The next prime is 864185207. The reversal of 864185197 is 791581468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725440356 + 138744841 = 26934^2 + 11779^2 .

It is a cyclic number.

It is not a de Polignac number, because 864185197 - 2²³ = 855796589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 864185197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864185107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432092598 + 432092599.

It is an arithmetic number, because the mean of its divisors is an integer number (432092599).

Almost surely, 2^864185197 is an apocalyptic number.

It is an amenable number.

864185197 is a deficient number, since it is larger than the sum of its proper divisors (1).

864185197 is an equidigital number, since it uses as much as digits as its factorization.

864185197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 864185197 is about 29397.0270095464. The cubic root of 864185197 is about 952.5086776879.

The spelling of 864185197 in words is "eight hundred sixty-four million, one hundred eighty-five thousand, one hundred ninety-seven".